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JIT: fix invocation of unboxed entry when method returns struct
If a value class method returns a struct, and its unboxed entry point requires a type context argument, make sure to pass the context argument properly. Also, fetch the type context (method table) from the box, rather than creating it from the class handle we have on hand; this tends to produce smaller code as we're often fetching the method table for other reasons anyways. Closes dotnet#52975.
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src/tests/JIT/opt/Devirtualization/structreturningstruct.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
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| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Threading; | ||
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| // Runtime issue 52975. | ||
| // | ||
| // If we devirtualize an interface call on a struct, ** and ** | ||
| // update the call site to invoke the unboxed entry, ** and ** | ||
| // the method returns a struct via hidden buffer pointer, ** and ** | ||
| // the unboxed method requires a type context arg, | ||
| // | ||
| // we need to be careful to pass the type context argument | ||
| // in the right spot in the arglist. | ||
| // | ||
| // The test below is set up to devirtualize under PGO. | ||
| // | ||
| // COMPlus_TieredPGO=1 | ||
| // COMPlus_TC_QuickJitForLoopsO=1 | ||
| // | ||
| class X | ||
| { | ||
| static int F(IDictionary i) | ||
| { | ||
| int r = 0; | ||
| IDictionaryEnumerator e = i.GetEnumerator(); | ||
| while (e.MoveNext()) | ||
| { | ||
| // This is the critical call. | ||
| // | ||
| DictionaryEntry entry = e.Entry; | ||
| r++; | ||
| } | ||
| return r; | ||
| } | ||
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| public static int Main() | ||
| { | ||
| Dictionary<string, string> s = new Dictionary<string, string>(); | ||
| s["hello"] = "world"; | ||
| int r = 0; | ||
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| for (int i = 0; i < 50; i++) | ||
| { | ||
| r += F(s); | ||
| Thread.Sleep(15); | ||
| } | ||
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| int iter = 100; | ||
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| for (int i = 0; i < iter; i++) | ||
| { | ||
| r += F(s); | ||
| } | ||
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| int result = 2 * (r - iter); | ||
| Console.WriteLine($"Result={result}"); | ||
| return result; | ||
| } | ||
| } |
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src/tests/JIT/opt/Devirtualization/structreturningstruct.csproj
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| @@ -0,0 +1,27 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| </PropertyGroup> | ||
| <PropertyGroup> | ||
| <DebugType>PdbOnly</DebugType> | ||
| <Optimize>True</Optimize> | ||
| </PropertyGroup> | ||
| <PropertyGroup> | ||
| <!-- This test requires tiered compilation and PGO --> | ||
| <CLRTestBatchPreCommands><![CDATA[ | ||
| $(CLRTestBatchPreCommands) | ||
| set DOTNET_TieredCompilation=1 | ||
| set DOTNET_TieredPGO=1 | ||
| set DOTNET_TC_QuickJitForLoops=1 | ||
| ]]></CLRTestBatchPreCommands> | ||
| <BashCLRTestPreCommands><![CDATA[ | ||
| $(BashCLRTestPreCommands) | ||
| export DOTNET_TieredCompilation=1 | ||
| export DOTNET_TieredPGO=1 | ||
| export DOTNET_TC_QuickJitForLoops=1 | ||
| ]]></BashCLRTestPreCommands> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <Compile Include="structreturningstruct.cs" /> | ||
| </ItemGroup> | ||
| </Project> |